Error52111: GCM/FCM unknown errorPositive FeedbackNegative FeedbackDescriptiondescription page anchorPositive FeedbackNegative Feedback Possible causespossible-causes page anchorPositive FeedbackNegative Feedback Unknown GCM/FCM error. Possible solutionspossible-solutions page anchorPositive FeedbackNegative Feedback If the problem persists, contact customer support(link takes you to an external page) and provide the time of the error and details about the requests that are failing.